Most deadlines in commercial real estate are negotiated. This one is not. A Wyoming owner who disagrees with the county’s value on a commercial property has a short, fixed window to say so, and it starts before many owners open their mail.
This article lays out that window, a day-by-day plan for using it, and what a well-organized contest contains. It is not legal advice, and nothing here predicts how a county will rule. For a complex case, an attorney’s advice is worth having.
The rule, in one paragraph
According to Washakie County’s review and appeal page, assessment schedules (notices of valuation) are mailed to property owners on or before the fourth Monday of April. An owner who wants to contest must file no later than 30 days after the mail date on the notice.
That is the whole rule this article relies on. The form to use, where to file it and what happens after filing are set out in your county’s own instructions. Read them, and call the assessor’s office if anything is unclear.
Count from the mail date
The 30 days run from the mail date printed on the notice. They do not run from the day it reached your mailbox, or the day you opened it, or the day your property manager forwarded it.
Here is an illustrative count. The fourth Monday of April 2027 falls on April 26. If your notice shows a mail date of Monday, April 26, 2027, then 30 days after it is Wednesday, May 26, 2027.
If the notice went out a week earlier, with a mail date of April 19, the same count ends on Wednesday, May 19. An owner who opens that notice on May 1 has already used twelve of the thirty days.
Confirm the exact last day with your county, and plan to file several days before it. A filing made on the last afternoon leaves no room for a missing page.
A day-by-day plan
Using the example mail date of April 26, 2027, a workable plan looks like this:
- Days 1 to 3 (April 27 to 29): read the notice, circle the mail date, check the facts on it and call the assessor’s office with any questions.
- Days 4 to 7 (April 30 to May 3): gather the documents listed below and decide whether to get an independent value.
- Days 8 to 16 (May 4 to May 12): the independent review runs. Seven business days from complete documents on May 3 ends on May 12.
- Days 17 to 24 (May 13 to May 20): decide whether to contest, assemble the packet and file.
- Days 25 to 30 (May 21 to May 26): buffer. Plan never to need it.
The plan only works if the documents are ready to send in the first week. That is why the real work starts before April.
Check the notice first
Before arguing about value, make sure the notice describes the right property. These checks take minutes:
- Owner name and mailing address are correct.
- Parcel number and legal description match your property.
- Building facts (square feet, year built, use) match what you own, as far as the notice or the county’s record shows them.
- Class is what you expect. Commercial property is assessed at 9.5% of market value and industrial at 11.5%, per Teton County’s guide to determining property tax. Classification is the assessor’s determination; if you are unsure, ask the assessor and your CPA.
- Market value is in a range your own evidence supports.
A factual error in the record is simpler to show than a difference of opinion about value. Raise it first, early in the window.
Is the gap worth contesting?
Take a hypothetical 16,000 square foot office building in Laramie, classed commercial, with one suite vacant. The figures are illustrative.
| Item | Math | Figure |
|---|---|---|
| County’s market value on the notice | $2,100,000 | |
| Owner’s NOI, from the last twelve months | $150,000 | |
| Cap rate from comparable sales | 8.5% | |
| Owner’s indicated value | $150,000 ÷ 0.085 | about $1,765,000 |
| Gap in market value | $2,100,000 − $1,765,000 | $335,000 |
| Gap in assessed value at 9.5% | $335,000 × 0.095 | $31,825 |
NOI is net operating income, the rent left after operating expenses. Each mill of levy on $31,825 of assessed value is about $31.83 of tax a year, so the dollar effect depends on the levy on your bill.
Whether that gap is worth contesting depends on three things: the size of the dollar difference at your levy, the strength of the evidence behind your number, and your time. None of it is a forecast that the county will agree. The county decides.
What to gather
The evidence that tests a value is mostly paper you already have. Gather it in the first week:
- The notice itself, and last year’s notice for comparison
- A current rent roll, and the leases behind it
- The trailing twelve months of income and expense, showing actual vacancy
- Recent sales of similar buildings nearby, with dates, sizes and prices
- Condition evidence: inspection reports, contractor bids, dated photos
- Any recent purchase price, listing or offer on the property
If a document is missing, note it rather than waiting for it. A packet with one gap filed on time beats a complete one filed late.
What a good packet contains
A contest is easier to follow when it reads like a short report, not a stack of attachments. A clear packet usually includes:
- A one-page summary: the county’s value, your value, the difference and the main reason.
- The income math: NOI tied to the operating statement, and a cap rate argued from comparable sales.
- Comparable sales, with the adjustments for size, age, condition and location shown.
- Lease evidence: the rent roll and lease summaries that show actual rents and vacancy.
- Condition evidence, where it affects value.
- Corrections to any factual errors in the county’s record.
Check your county’s instructions for any required form, number of copies or filing method. Those details are the county’s to set.
Mistakes that cost the window
The common ways owners lose the chance to contest are mostly about time, not evidence.
- Waiting for the tax bill. The window is tied to the notice of value, not to the bill.
- Counting from the wrong day. Count from the mail date printed on the notice.
- An old mailing address. A notice sent to a former address can use up days before you see it.
- Arguing the tax, not the value. The notice states a market value. Evidence about value is what answers it.
- A number without math. A figure with no comparables or income behind it is hard for anyone to weigh.
- Starting the documents in May. Thirty days is enough to organize evidence, not to find it.
A snapshot or a full review?
Two of our programs fit inside the window, depending on what you need.
A valuation snapshot is a quick, desktop check of whether the county’s number is in a reasonable range: comparables, an income check and a one-page memo. It is from $950 per property, in five business days from complete documents. If the snapshot says the value is reasonable, you can stop there.
A property tax assessment review is built for the contest itself. It tests the county’s value against the market and prepares the packet and the evidence for you to file, from $1,200 per property, in seven business days, inside the 30-day window. It is a fixed fee with no contingency. You file; we prepare. We never promise a result.
Both sit within our property valuation work, and both are opinions of value, not appraisals. Fees are on the pricing page.
Prepare before April
The calm way to use a 30-day window is to need only the last part of it. Close the books for the year, update the rent roll and confirm your mailing address with each county before the notices go out. Our Wyoming property tax calendar sets those steps month by month.
Before the next notice arrives
If you own commercial property in Wyoming and suspect the county’s value is off, now is a better time to check than the week the notice lands. Book a free 30-minute scoping call and we will tell you whether a valuation snapshot or a property tax assessment review fits, what it costs and what to have ready by April.
